2009
DOI: 10.1071/fp09046
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Hydraulic redistribution by Protea 'Sylvia' (Proteaceae) facilitates soil water replenishment and water acquisition by an understorey grass and shrub

Abstract: Proteaceae of the Cape Floristic Region, South Africa, transpire throughout the summer drought, implying access to deep water. Hydraulic redistribution by Protea ‘Sylvia’ [P. susannae E. Phillips × P. exima (Salisb. Ex Knight) Fource; Proteaceae] was investigated in overnight pot and field experiments, where it was hypothesised that (1) Proteaceae replenish water in upper soil layers, (2) hydraulic redistribution facilitates nutrient uptake and (3) shallow-rooted understorey plants ‘parasitise’ water from prot… Show more

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Cited by 48 publications
(39 citation statements)
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“…Some desert species have the capacity to take up nutrients from very dry soils (e.g., *-5 MPa; Matzner and Richards 1996), and Buffalo grass may be able to extract nutrients even under dry soil conditions (Huang 1999). Previous studies found that HL did not increase plant acquisition of NO 3 - (Snyder et al 2008) or other nutrients (see Online resource 1 for details; Crabtree et al 1998;Hawkins et al 2009;Rose et al 2008;Wang et al 2009), while other studies suggested that HL increased plant uptake of mineral N compounds (Dawson 1997;de Kroon et al 1998;Huang 1999;Leffler et al 2004). However, all these latter studies added labeled N as liquid pulses, and thus the nutrient could have Table 3 Plant growth parameters including root-to-shoot ratio (shoot is considered the biomass of live leaves only), specific leaf area (SLA), total N concentration in leaves and roots (mean ± 1SE; n = 6), d 15 N in leaves, stolons and roots from lower compartment (mean ± 1SE; n = 3 for stolons, n = 6 for leaves and roots) and overall above-(leaves and stolons) and below-ground plant 15 N content (mean ± 1SE; n = 5-6) Fig.…”
Section: Discussionmentioning
confidence: 99%
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“…Some desert species have the capacity to take up nutrients from very dry soils (e.g., *-5 MPa; Matzner and Richards 1996), and Buffalo grass may be able to extract nutrients even under dry soil conditions (Huang 1999). Previous studies found that HL did not increase plant acquisition of NO 3 - (Snyder et al 2008) or other nutrients (see Online resource 1 for details; Crabtree et al 1998;Hawkins et al 2009;Rose et al 2008;Wang et al 2009), while other studies suggested that HL increased plant uptake of mineral N compounds (Dawson 1997;de Kroon et al 1998;Huang 1999;Leffler et al 2004). However, all these latter studies added labeled N as liquid pulses, and thus the nutrient could have Table 3 Plant growth parameters including root-to-shoot ratio (shoot is considered the biomass of live leaves only), specific leaf area (SLA), total N concentration in leaves and roots (mean ± 1SE; n = 6), d 15 N in leaves, stolons and roots from lower compartment (mean ± 1SE; n = 3 for stolons, n = 6 for leaves and roots) and overall above-(leaves and stolons) and below-ground plant 15 N content (mean ± 1SE; n = 5-6) Fig.…”
Section: Discussionmentioning
confidence: 99%
“…In addition to its primary role of increasing soil moisture, HL has been suggested by numerous authors to be a potential mechanism to increase the availability of nutrients for plants (Caldwell et al 1998;Caldwell and Manwaring 1994;Dawson 1993Dawson , 1997Hawkins et al 2009;Jackson et al 2000;Liste and White 2008;Richards and Caldwell 1987;Rose et al 2008;Smart et al 2005;Snyder et al 2008). Nutrients levels and rates of biogeochemical processes such as decomposition, mineralization, and nitrification are usually highest in the upper layers of soils, where biological and atmospheric inputs of nutrients to the soil are the greatest (Schlesinger 1997).…”
Section: Introductionmentioning
confidence: 98%
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“…Hawkins et al 2009;Schoonmaker et al 2007;Zou et al 2005), the net effect of placing shallow-rooted species with strongly competitive deep-rooted perennials has tended towards negative. For example, grasses growing under the Tanzanian savannah tree Acacia tortilis (Forssk.)…”
Section: Introductionmentioning
confidence: 97%